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98ascot

Posted 7/2/2006 4:59 AM (#107855)
Subject: Aluminium Throttle body thing

GTi-R100

Posts: 4825
2000

Location: Carlisle - Cumbria

just wondering if this would fit my 1.1 MPi? its off a Rover 45 1.6 k-series and the stepper motor was reset around 1000 miles ago at rover garage

(4c_1_b.jpg)

Attachments
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4c_1_b.jpg (15KB - 72 downloads)

R119GTA

Posted 7/2/2006 7:30 AM (#107882 - in reply to #107855)
Subject: RE: Aluminium Throttle body thing

Metro Mad

Posts: 7653
5000

Location: Tamworth, Staffs

yes, bolts straight on, when you fit it with everything connected, switch your ignition on and pump the throttle 8 times fully on and off to re set the stepper motor just incase the ecu doesn't pick up a clear signal, otherwise you may find it wont idle correctly.

114gta

Posted 7/2/2006 7:38 AM (#107885 - in reply to #107855)
Subject: RE: Aluminium Throttle body thing

I'm not an 'expert' at anything but being short

Posts: 6154
5000

Dont let them charge you any more for the stepper being reset, it dosent even have a stepper motor with it, thats on your inlet manifold. Lol. As Matt said, you reset the stepper yourself.

98ascot

Posted 7/2/2006 7:42 AM (#107886 - in reply to #107855)
Subject: RE: Aluminium Throttle body thing

GTi-R100

Posts: 4825
2000

Location: Carlisle - Cumbria

ok thanks guys! never actualy realised the stepper motor is not on that bit hehe.

Rapier

Posted 7/2/2006 11:19 AM (#107932 - in reply to #107855)
Subject: RE: Aluminium Throttle body thing

Regular

Posts: 124
100

Location: Hierden, The Netherlands

It would fit yes, but I take it it is an replacement. Because it surely isn't an upgrade over the std item.

98ascot

Posted 7/2/2006 12:30 PM (#107946 - in reply to #107855)
Subject: RE: Aluminium Throttle body thing

GTi-R100

Posts: 4825
2000

Location: Carlisle - Cumbria

yea just replacement, tryin to stop revs from sticking when i change gear

114gta

Posted 7/2/2006 2:01 PM (#107972 - in reply to #107855)
Subject: RE: Aluminium Throttle body thing

I'm not an 'expert' at anything but being short

Posts: 6154
5000

First, have you tried resetting your stepper motor?

AdrianSi

Posted 7/2/2006 5:23 PM (#108036 - in reply to #107855)
Subject: RE: Aluminium Throttle body thing

Expert

Posts: 8490
5000

Location: Midlands

Ah haaa....just had a thought about this idle problem...is that the original cam cover? sound silly but i notice you have polished the lines off. the cam covers are different between MPi and SPi and it causes this raised idle problem

i know this sounds unbeliveable but its what i found when converting from 8v spi to 8v mpi...

98ascot

Posted 8/2/2006 4:37 AM (#108074 - in reply to #108036)
Subject: RE: Aluminium Throttle body thing

GTi-R100

Posts: 4825
2000

Location: Carlisle - Cumbria

114gta - 7/2/2006 8:01 PM

First, have you tried resetting your stepper motor?

erm.. no. how do i do it? just get in the car and press throttle pedal 8 times?

AdrianSi - 7/2/2006 11:23 PM

Ah haaa....just had a thought about this idle problem...is that the original cam cover? sound silly but i notice you have polished the lines off. the cam covers are different between MPi and SPi and it causes this raised idle problem

i know this sounds unbeliveable but its what i found when converting from 8v spi to 8v mpi...

as far as i know its original, i polished the lines and painted the lower part to make it look better

Edited by 98ascot 8/2/2006 4:39 AM

(Cam cover 02.jpg)

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Cam cover 02.jpg (94KB - 74 downloads)

114gta

Posted 8/2/2006 7:22 AM (#108105 - in reply to #107855)
Subject: RE: Aluminium Throttle body thing

I'm not an 'expert' at anything but being short

Posts: 6154
5000

To reset the stepper, turn the ignition to position II (so the warning lights come on your dash but you dont start it), fully press and release the throttle at least 8 times ( make sure the throttle is hitting the stop and fully returning each time. i do it about 12 times to be sure, lol) and then turn the ignition off again. This will reset the motor, start it up and give it a try!

AdrianSi

Posted 8/2/2006 12:08 PM (#108167 - in reply to #107855)
Subject: RE: Aluminium Throttle body thing

Expert

Posts: 8490
5000

Location: Midlands

If non of the things in this thread so far fixes the problem...next time the idle gets stuck, try getting an pair of pliers and squeezing the pipe circled below...this will prove a) the cam cover is correct and b) that there isnt an engine breathing problem.

AdrianSi

Posted 8/2/2006 12:08 PM (#108168 - in reply to #107855)
Subject: RE: Aluminium Throttle body thing

Expert

Posts: 8490
5000

Location: Midlands

(engine.JPG)

Attachments
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engine.JPG (66KB - 67 downloads)

Dave VVC

Posted 8/2/2006 3:32 PM (#108204 - in reply to #107855)
Subject: RE: Aluminium Throttle body thing

Expert

Posts: 2965
2000

Just to finish what you were saying about resetting the idle valve.
Ign on press throttle to full 5 times, turn the ign off and leave it
off untill the ecu powers down, this can take anything fro 30 secs to
5 mins, A good way of checking is to put a voltmeter across any wire
on the engine that is brown with a pink tracer, ie on the charcoal can.
this wire will be live when the ign is tuned off untill the ecu has
powered down. That way the ecu has looked at the sensors, resets the idle valve
and powers down.
Cheers.
Dave C.

114gta

Posted 9/2/2006 7:37 AM (#108361 - in reply to #108204)
Subject: RE: Aluminium Throttle body thing

I'm not an 'expert' at anything but being short

Posts: 6154
5000

copson1998.fsnet.co. - 8/2/2006 9:32 PM

Just to finish what you were saying about resetting the idle valve.
Ign on press throttle to full 5 times, turn the ign off and leave it
off untill the ecu powers down, this can take anything fro 30 secs to
5 mins, A good way of checking is to put a voltmeter across any wire
on the engine that is brown with a pink tracer, ie on the charcoal can.
this wire will be live when the ign is tuned off untill the ecu has
powered down. That way the ecu has looked at the sensors, resets the idle valve
and powers down.
Cheers.
Dave C.

Didn't know that, works on mine without waiting.

98ascot

Posted 9/2/2006 9:40 AM (#108393 - in reply to #107855)
Subject: RE: Aluminium Throttle body thing

GTi-R100

Posts: 4825
2000

Location: Carlisle - Cumbria

thanks for info.just done it, seems ok so far. might take it for a long run out at the weekend if it passes MOT

shud do it gets everything it wants

Duckers

Posted 10/2/2006 1:35 PM (#108758 - in reply to #107855)
Subject: RE: Aluminium Throttle body thing

Mad 1.8 Cabby Driver!

Posts: 875
500

Location: Skegness

I am about to the SPI/MPI conversion on my 8 valve. So what are the differences in the cam covers? Just curious.

AdrianSi

Posted 10/2/2006 1:44 PM (#108762 - in reply to #107855)
Subject: RE: Aluminium Throttle body thing

Expert

Posts: 8490
5000

Location: Midlands

The breather has a greater restriction on the MPi. The camcover is a cast alloy and then the outlets such as the one i have highlighted are drilled through. The hole diameter on the MPi is smaller about 1mm-1.5mm incomparion to the about 3mm on the SPi(these are just reference figures as an example).

With the MPi manifold fitted the air inlet pressure is higher and draws oil into the inlet...causing the idle to to be raised. The amount of oil it draws through is really quite astonishing and also caused major sticking throttle probs.

If you do fit the MPi and keep the Spi cover you will need to restrict this pipe highlighted quite significantly to correct the idle and ensure the engine breaths correctly...

Hope that helps...

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